Rod-packing



I. SMITH. 4ROD PACKING;

APPLICATION FILED AUG.2'8, 1917.

Patented Apr. 27, 1920..

by y,

l Attomys TuSMITH.

Roo PAC KING.

APPLICATIONv FILED AUG-28.1917

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T. SMITH.

ROD PACKING.

APPLICATION man Amma, 19:1. v 'Patented Apr. 27, 1920.

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N' 4y v, linventor Attorneys THOMAS SMITH, or MHADVILLE, PENNSYLVANIA.

j j' ROD-PACKING.

Specification of Letters Patent. Patented Apl. 27, 1920.

`App1ication filed August 28, 1917. Serial No. 188,632.

To all whom t may concern: A.

Be it known that I, THOMAS SMITH, acitizen of the United States,residing at4 Meadville, in the county of Crawford and State ofPennsylvania, have invented a newv and useful Rod-Packing, of which thefollowing is a specication.

The device forming the subject matter of this application is a rodpacking, adapted especially for use on piston rods of locomotiveengines, on valve stems and the like.-

The invention aims to provide novel means for holding the parts of thesegmental packing rings in place with respect to each other and withrespect to a cup wherein the rings are disposed.

Another object of the invention is to provide novel means whereby theparts of the rings will be prevented from moving outwardly against thewall of the cup, the construction being such that the pressure at alltimes will be effective to set up the rings `on the rod.

It is within the province of the disclosure to improve generally and toenhance, the utility of devices of that type to which the presentinvention appertains.

With the above and otherobjects in View which will appear asthedescription proceeds, the invention resides in the'combination andarrangement of parts and in the details of construction hereinafterdescribed and claimed, it being understood that changes in the preciseembodiment of the invention herein disclosed can be made within thescope of what is claimed, without departing from the spirit of theinvention.

In the accompanying drawings Figure 1 shows in front elevation,`aportion of the cylinderof a locomotiveengine, whereunto the deviceforming the" subject matter of this applicationv has been applied, thepiston rod appearing'in section; l

Fig. 2 is a section taken lapproximately on the line 2-2 of Fig. 1, thepiston rod appearing in elevation;

Fig. 3 is a section `on the line l3--3 of iFig. 2;

Fig. 4 Fig. 2; Figs.

V5 and 6 are transverse sectional views showing modified forms of theinven- Y tion;

Figs.

modifications in certain of the rings; Y

Figs. 8, 10 and 12 are elevations of the ceptaCle. v'showny at 12 tocoperate with a piston rod is a section on the line 4 4 ofv 7, 9 and 11are top'plans showing the forward ring being spaced as indicatedstructures shown, respectively,"V in Figs. 7, 9

.and 11.

Referring to that form of the invention which is disclosed in Figs. 1 to4, both inclusive, the numeral 1 denotes a cylinder head provided with astuing box 2 coperating with a gland `3 held to the stufiin box 2 bymeans of bolts 4. The rearface o the gland 3 is provided with an annularrecess 5 re- `case isslidably mounted a receptacle 9 hav. -ing an outletV10, the numeral 11 marking any suitable source of*V oil supply for there- The receptacle 9. is curved as 14 having an enlarged end 15. Anysuitable lubricating means may be provided, however.

The gland 3 is supplied withk an opening 16 through which the piston rod14 passes, this opening being slightly greater in diameter than theenlarged end V15 of the piston rod 14. In the Cylinder head 1 isfashioned an opening 17 which, like the` opening 16, is

slightly larger in diameter than the end 15 of the piston rod 14. Thestufling box 2 isv providedV with a chamber 18 defining a shoulder 19adjacent the opening 17.

. Disposed within the chamber 18v and surrounding the piston rod 14'is acup 20 which abuts withV a ground joint against'the rib 7 j ofthe gland3'. The cup l20 has a tapered .opening 21 in which fits la tapered,two-part bushing 22, the constituent members of which may be united bymeans of dowel pins 23. The bushing 22is supplied adjacent its rear endwith a flange 24 received in a correspondingly shaped recess formed inthe cup 20. The wall of thecup 20 is provided in its interior, as'shownin Figs. 3 and 4, with grooves 25, 26, 27 and 28. Thebushing `22 may beofvarious forms, without jeopardizing 'the utility of the invention, andif the piston rod 14 does nothave thecnlarged end 15, then the bushing22 may be omitted entirely.

Disposed within the cup 2() and abutting againstthe bushing 22 is aforward ring comprising a part 29 and a smaller part 30,

at 31 from the inner surface ofthe cup 20.

The part 29 of the ring has lugs 32 received in the grooves 26'and 25 ofthe cup 20, the part 30 of the forward ring having a lug 33 which isreceived in the groove 28 of the cup. Near to its ends the part 29 ofthe forward. ring is supplied with recesses l34 in which the ends of theVpart 30 of the ring are slidably received, the parts of the ring, attheirl ends, having flat, slidably coperating faces shown at Y YDisposed within the cup 20, about the piston rod 14, and abuttingagainst the forward ring, is a rear ring, comprising vparts 36 land TheVpart 36 of lthe rear ring is provided with lugs 3S received in thegrooves 27l and 28, the part 37 of the rear ring being equipped. withlugs 39 received in the grooves 25 and 26. rI`he`ends of the parts 36and 37 of the rear ring are spaced as shown at 40. It is to be observedthat owing to the way in which the ribs on the forward and rear ringscoact with the grooves in the cup, the spaces 40 between the parts36 and37 of the rear ring will be maintained outof alin'ement with the spaces34 between the parts 29 and 30 of the vforward'ring, so that there willbe no yleakage of pressure. As clearly shown in Fig. 2, the parts 36 and37 of the rear ring are beveled inwardly and rearwardly, as indicated'at41.

Thepiston rod 14 is .surrounded by a retaining ring 42 including aflange 43 against which 4abuts one end of a compression spring 44, theother end of the compression spring abutting against the shoulder 19.vThe spring 44 surrounds the ring 42 (which is made in two parts) andholds theV parts .together.` As shown at 45, the retaining ring V42 isbeveled outwardly7 and forwardly, vto

coperatc with the beveled siu'face 41 of the rear ring. Thisconstruction prevents the rear ring from moving outwardly, into contactwith' the wall of the cup 20, and as a consequence, pressure can alwaysfind its way about the forward and rear rings, to set the same up snuglyon the piston rod 14.

It is not necessary that the ring 42 be held about the rod 14 by theaction ofthe spring 44 alone. VIn Fig. 6 of the drawings, the numeral 46marks the piston, the two-part retaining ring is shown at 47, and thespring appears at 48. In this form of the invention, the constituentmembers of the retaining ring 47 are held by a continuous ring 49against outward radial movement.

In Fig. 5 of the drawings, the cup is shown at 50 and the grooves appearat 51.

The numeral 56 marks the piston rod. The

ring is made up .of like parts 52, having lugs 53 coperating with thegrooves 51. In one A end -of each ring part 52 there is fashioned arecess 54 receiving the thinned end 55 of the other ring part.

In Figs. 7 and 8 ofthe drawings, one'part '57 of the ring is ofconsiderably greater circumferential extent than the other part 5Sthereof, theparts 57 land 58 ofthe ring being halved together slidably`as shown .at 59, the

beveling of .the ring 4appearing at 60, .and the lugs vbeing' shown at61.

In Figs. 9 and 10, the parts of the ring are shown. at 62 and are oflike construction, so far as circumferential extent is concerned,

'the parts 62 of the ring being halved toinvention, 'the ring is devoidof lugs, and

when sucha ring as that shown in Figs.. 11

Vand 12 is used, the cup will be devoid of the grooves hereinbeforedescribed.

Figs. 7, '8, 9 .and 10 indicate thatv the specific form of ring employedmay be varied from the showing of Figs. 3 and 4.

Having thus described the invention, what is claimedis In a device oftheclass described, a stuffing box; a gland constituting a'closurc.

therefor; a'cup abutting against the gland; a segmental forward ring inthe cup; a segmental rear ring in the cup and having an inwardly andrearwardlybeveled end face; a retaining ring having a ybeveled facecooperating with'the .beveled face of the rear ring 'to p reventthelatter from expanding outwardly against the cup; spring means foradvancing the retaining ring; interengaging elements on the cup fand thesegmentalrings coacting to render the forward ring responsivevto'thrust.and radial movement, only, derived fromthe rear ring; and a rodworlringin the rings,

In testimony thatI my own, -I have hereto aflixed my signature in thepresence of two witnesses.-

' THOMAS. SMITH.' f Witnesses :Y

RALPH SHADLEY,

JAMES S. WALTER.

claim the foregoing as

